Canadian Poison Plant - This plant can produce
toxic quantities of HCN if it is damaged through frost, mastication,
or water stress. Johnson grass can also accumulate toxic amounts
of nitrate under certain circumstances. Cattle and a horse were
poisoned after ingesting Johnson grass. Plants are spread from
rhizomes but susceptibility to severe frost has limited the
plants to a few counties in southwestern Ontario. The grass
is found in fields and field edges. Toxicity is not likely,
but ingesting large quantities of Johnson grass can cause problems
(Gray et al. 1968, Clay et al. 1976, Warwick and Black 1983).

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